Mitsubishi SRK100VNXWPZSX, Service Manual

Page: 110 / 202

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109
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'20 • PAC-SM-351
Error code
Remote control:
LED Green Red
Indoor
Outdoor
Content
E28
Remote control
temperature sensor anomaly
Keeps flashing Stays OFF
Keeps flashing Stays OFF
1. Applicable model
5. Troubleshooting
Diagnosis Countermeasure
NO
YES
NO
YES
Is the remote
control temperature sensor
connected properly?
Are the
characteristics of
remote control temperature
sensor OK?
Is the temperature sensor wire
OK?
Temperature-resistance characteristics of remote control temperature sensor (Thc)
0
1
2
4
6
8
10
12
Temperature (°C)
65
62
59
53
48
44
40
36
14
16
18
20
22
24
26
28
33
30
27
25
23
21
19
18
30
32
34
36
38
40
42
44
16
15
14
13
12
11
9.9
9.2
46
48
50
52
54
56
58
60
8.5
7.8
7.3
6.7
6.3
5.8
5.4
5.0
Resistance value (k
Ω
) Temperature (°C) Resistance value (k
Ω
)
Correct connector.
Defective remote control
temperature sensor
➞
Replace.
Defective remote control
PCB
➞
Replace.
(Defective remote control
temperature sens or input
circuit)
2. Error detection method
Detection of anomalously low
temperature (resistance) of
remote control temperature
sens or (Thc)
3. Condition of error displayed
When the temperature sensor
detects -50°C or lower for
5 seconds continuously,
the compressor stops. After
3-minute delay, the compressor
starts again automatically, but
if this error occurs again within
60 minutes after the initial
detection.
4. Presumable cause
• Faulty connection of remote
control temperature sensor
• Defective remote control
temperature sensor
• Defective remote control PCB
Note:
After 10 seconds has passed since remote control temperature sens or was switched from valid to invalid, E28 will not be displayed even if the
sens or harness is disconnected. At same time the temperature sens or, which is effective, is switched from remote control temperature sensor to
indoor return air temperature sens or. Even though the remote control temperature sens or is set to be effective, the return air temperature displayed
on remote control for checking still shows the value detected by indoor return air temperature sens or, not by remote control temperature sensor.
NO
YES
NO
YES
Is the remote
control temperature sensor
connected properly?
Are the
characteristics of
remote control temperature
sensor OK?
Is the temperature sensor wire
OK?
Temperature-resistance characteristics of remote control temperature sensor (Thc)
0
1
2
4
6
8
10
12
Temperature (°C)
65
62
59
53
48
44
40
36
14
16
18
20
22
24
26
28
33
30
27
25
23
21
19
18
30
32
34
36
38
40
42
44
16
15
14
13
12
11
9.9
9.2
46
48
50
52
54
56
58
60
8.5
7.8
7.3
6.7
6.3
5.8
5.4
5.0
Resistance value (k
Ω
) Temperature (°C) Resistance value (k
Ω
)